为满足大功率牵引电传动应用场景对电机输出转矩高精度、快响应等要求,文章提出一种基于间接定子量控制(Indirect Stator Quantities Control,ISC)的牵引电机三电平驱动控制方法.首先,结合ISC控制特点和异步电机模型提出了一种动态弱磁控制方法,保证了电机在高速弱磁区转矩的高动态响应.其次,为有效解决传统三电平算法存在的中点电位不平衡问题,根据中点箝位型(Neutral Point Clamped,NPC)三电平逆变器不同开关矢量对中性点电位的不同作用,基于电荷周期平衡精准计算和比例积分(Proportional Integral,PI)控制器原理,提出了一种具有平衡精度高、抗干扰性能强的新型中点电位平衡控制策略.最后通过仿真研究与某轨道交通大功率异步电机对拖试验测试,试验结果表明文章所提出的控制方法具有高动态响应、高中点电位平衡度、高转矩控制精度等优点.
A study on the application of a three-level control technology for traction motors based on indirect stator quantities
In order to meet the requirements of high-power traction electric drive applications for high precision and fast response of motor output torque,this paper proposes a three-level drive control method for traction motors based on indirect stator quantities con-trol(ISC).Firstly,a dynamic flux weakening control method based on the characteristics of ISC control and the model of induction mo-tor,was proposed to ensure the high dynamic response of motor torque in the high-speed flux weakening region;then,in order to effec-tively solve the problem of neutral-point potential imbalance in traditional three-level algorithms,according to the different effects of dif-ferent switch vectors on the neutral-point potential of the neutral point clamped(NPC)three-level inverter,a new neutral-point potential balance control strategy with high balance accuracy and strong anti-interference performance was proposed based on precise calculation of charge cycle balance and principles of proportional integral(PI)controller.Finally,this method was tested through simulation research and the back-to-back testing with a high-power induction motor for rail transit.The test results show the control method proposed in this paper has advantages of high dynamic response,high neutral-point potential balance,and high torque control accuracy.
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